<title>[bzoj1123][POI2008]BLO</title><link href="http://hzoi.com/tomorrow.css" rel="stylesheet"><div class="ui existing segment"><pre><code><span class="pl-cp">#include</span><span class="pl-cpf">&lt;bits/stdc++.h&gt;</span><span class="pl-cp"></span>
<span class="pl-k">using</span> <span class="pl-k">namespace</span> <span class="pl-n">std</span><span class="pl-p">;</span>
<span class="pl-k">const</span> <span class="pl-kt">int</span> <span class="pl-n">maxn</span><span class="pl-o">=</span><span class="pl-mi">1000010</span><span class="pl-p">;</span>
<span class="pl-kr">inline</span> <span class="pl-kt">int</span> <span class="pl-nf">read</span><span class="pl-p">()</span>
<span class="pl-p">{</span>
    <span class="pl-kt">int</span> <span class="pl-n">x</span><span class="pl-o">=</span><span class="pl-mi">0</span><span class="pl-p">,</span><span class="pl-n">t</span><span class="pl-o">=</span><span class="pl-mi">1</span><span class="pl-p">;</span><span class="pl-kt">char</span> <span class="pl-n">ch</span><span class="pl-o">=</span><span class="pl-n">getchar</span><span class="pl-p">();</span>
    <span class="pl-k">while</span><span class="pl-p">(</span><span class="pl-n">ch</span><span class="pl-o">&gt;</span><span class="pl-sc">&#39;9&#39;</span><span class="pl-o">||</span><span class="pl-n">ch</span><span class="pl-o">&lt;</span><span class="pl-sc">&#39;0&#39;</span><span class="pl-p">){</span><span class="pl-k">if</span><span class="pl-p">(</span><span class="pl-n">ch</span><span class="pl-o">==</span><span class="pl-sc">&#39;-&#39;</span><span class="pl-p">)</span><span class="pl-n">t</span><span class="pl-o">=-</span><span class="pl-mi">1</span><span class="pl-p">;</span><span class="pl-n">ch</span><span class="pl-o">=</span><span class="pl-n">getchar</span><span class="pl-p">();}</span>
    <span class="pl-k">while</span><span class="pl-p">(</span><span class="pl-n">ch</span><span class="pl-o">&gt;=</span><span class="pl-sc">&#39;0&#39;</span><span class="pl-o">&amp;&amp;</span><span class="pl-n">ch</span><span class="pl-o">&lt;=</span><span class="pl-sc">&#39;9&#39;</span><span class="pl-p">)</span> <span class="pl-n">x</span><span class="pl-o">=</span><span class="pl-n">x</span><span class="pl-o">*</span><span class="pl-mi">10</span><span class="pl-o">+</span><span class="pl-n">ch</span><span class="pl-o">-</span><span class="pl-sc">&#39;0&#39;</span><span class="pl-p">,</span><span class="pl-n">ch</span><span class="pl-o">=</span><span class="pl-n">getchar</span><span class="pl-p">();</span>
    <span class="pl-k">return</span> <span class="pl-n">x</span><span class="pl-o">*</span><span class="pl-n">t</span><span class="pl-p">;</span>
<span class="pl-p">}</span>
<span class="pl-kt">int</span> <span class="pl-n">n</span><span class="pl-p">,</span><span class="pl-n">m</span><span class="pl-p">,</span><span class="pl-n">head</span><span class="pl-p">[</span><span class="pl-n">maxn</span><span class="pl-p">],</span><span class="pl-n">num</span><span class="pl-o">=</span><span class="pl-mi">0</span><span class="pl-p">;</span>
<span class="pl-kt">int</span> <span class="pl-n">dfn</span><span class="pl-p">[</span><span class="pl-n">maxn</span><span class="pl-p">],</span><span class="pl-n">low</span><span class="pl-p">[</span><span class="pl-n">maxn</span><span class="pl-p">],</span><span class="pl-n">size</span><span class="pl-p">[</span><span class="pl-n">maxn</span><span class="pl-p">],</span><span class="pl-n">tot</span><span class="pl-o">=</span><span class="pl-mi">0</span><span class="pl-p">;</span>
<span class="pl-kt">long</span> <span class="pl-kt">long</span> <span class="pl-n">ans</span><span class="pl-p">[</span><span class="pl-n">maxn</span><span class="pl-p">];</span>
<span class="pl-kt">bool</span> <span class="pl-n">cut</span><span class="pl-p">[</span><span class="pl-n">maxn</span><span class="pl-p">];</span>
<span class="pl-k">struct</span> <span class="pl-n">node</span><span class="pl-p">{</span>
    <span class="pl-kt">int</span> <span class="pl-n">v</span><span class="pl-p">,</span><span class="pl-n">nex</span><span class="pl-p">;</span>
<span class="pl-p">}</span><span class="pl-n">e</span><span class="pl-p">[</span><span class="pl-n">maxn</span><span class="pl-p">];</span>
<span class="pl-kt">void</span> <span class="pl-nf">add</span><span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">u</span><span class="pl-p">,</span><span class="pl-kt">int</span> <span class="pl-n">v</span><span class="pl-p">)</span>
<span class="pl-p">{</span>
    <span class="pl-n">e</span><span class="pl-p">[</span><span class="pl-o">++</span><span class="pl-n">num</span><span class="pl-p">].</span><span class="pl-n">v</span><span class="pl-o">=</span><span class="pl-n">v</span><span class="pl-p">;</span>
    <span class="pl-n">e</span><span class="pl-p">[</span><span class="pl-n">num</span><span class="pl-p">].</span><span class="pl-n">nex</span><span class="pl-o">=</span><span class="pl-n">head</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">];</span>
    <span class="pl-n">head</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">]</span><span class="pl-o">=</span><span class="pl-n">num</span><span class="pl-p">;</span>
<span class="pl-p">}</span>
<span class="pl-kt">void</span> <span class="pl-nf">tarjan</span><span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">u</span><span class="pl-p">)</span>
<span class="pl-p">{</span>
    <span class="pl-n">dfn</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">]</span><span class="pl-o">=</span><span class="pl-n">low</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">]</span><span class="pl-o">=++</span><span class="pl-n">tot</span><span class="pl-p">;</span>
    <span class="pl-n">size</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">]</span><span class="pl-o">=</span><span class="pl-mi">1</span><span class="pl-p">;</span>
    <span class="pl-kt">int</span> <span class="pl-n">flag</span><span class="pl-o">=</span><span class="pl-mi">0</span><span class="pl-p">,</span><span class="pl-n">sum</span><span class="pl-o">=</span><span class="pl-mi">0</span><span class="pl-p">;</span>
    <span class="pl-k">for</span><span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">i</span><span class="pl-o">=</span><span class="pl-n">head</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">];</span><span class="pl-n">i</span><span class="pl-p">;</span><span class="pl-n">i</span><span class="pl-o">=</span><span class="pl-n">e</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">].</span><span class="pl-n">nex</span><span class="pl-p">)</span>
    <span class="pl-p">{</span>
        <span class="pl-kt">int</span> <span class="pl-n">v</span><span class="pl-o">=</span><span class="pl-n">e</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">].</span><span class="pl-n">v</span><span class="pl-p">;</span>
        <span class="pl-k">if</span><span class="pl-p">(</span><span class="pl-o">!</span><span class="pl-n">dfn</span><span class="pl-p">[</span><span class="pl-n">v</span><span class="pl-p">])</span>
        <span class="pl-p">{</span>
            <span class="pl-n">tarjan</span><span class="pl-p">(</span><span class="pl-n">v</span><span class="pl-p">);</span>
            <span class="pl-n">size</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">]</span><span class="pl-o">+=</span><span class="pl-n">size</span><span class="pl-p">[</span><span class="pl-n">v</span><span class="pl-p">];</span>
            <span class="pl-n">low</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">]</span><span class="pl-o">=</span><span class="pl-n">min</span><span class="pl-p">(</span><span class="pl-n">low</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">],</span><span class="pl-n">low</span><span class="pl-p">[</span><span class="pl-n">v</span><span class="pl-p">]);</span>
            <span class="pl-k">if</span><span class="pl-p">(</span><span class="pl-n">low</span><span class="pl-p">[</span><span class="pl-n">v</span><span class="pl-p">]</span><span class="pl-o">&gt;=</span><span class="pl-n">dfn</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">])</span>
            <span class="pl-p">{</span>
                <span class="pl-n">ans</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">]</span><span class="pl-o">+=</span><span class="pl-p">(</span><span class="pl-kt">long</span> <span class="pl-kt">long</span><span class="pl-p">)</span><span class="pl-n">size</span><span class="pl-p">[</span><span class="pl-n">v</span><span class="pl-p">]</span><span class="pl-o">*</span><span class="pl-p">(</span><span class="pl-n">n</span><span class="pl-o">-</span><span class="pl-n">size</span><span class="pl-p">[</span><span class="pl-n">v</span><span class="pl-p">]);</span>
                <span class="pl-n">sum</span><span class="pl-o">+=</span><span class="pl-n">size</span><span class="pl-p">[</span><span class="pl-n">v</span><span class="pl-p">];</span>
                <span class="pl-n">flag</span><span class="pl-o">++</span><span class="pl-p">;</span>
                <span class="pl-k">if</span><span class="pl-p">(</span><span class="pl-n">u</span><span class="pl-o">!=</span><span class="pl-mi">1</span><span class="pl-o">||</span><span class="pl-n">flag</span><span class="pl-o">&gt;</span><span class="pl-mi">1</span><span class="pl-p">)</span> <span class="pl-n">cut</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">]</span><span class="pl-o">=</span><span class="pl-nb">true</span><span class="pl-p">;</span>
            <span class="pl-p">}</span>
        <span class="pl-p">}</span>
        <span class="pl-k">else</span> <span class="pl-n">low</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">]</span><span class="pl-o">=</span><span class="pl-n">min</span><span class="pl-p">(</span><span class="pl-n">low</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">],</span><span class="pl-n">dfn</span><span class="pl-p">[</span><span class="pl-n">v</span><span class="pl-p">]);</span>
    <span class="pl-p">}</span>
    <span class="pl-k">if</span><span class="pl-p">(</span><span class="pl-o">!</span><span class="pl-n">cut</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">])</span> <span class="pl-n">ans</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">]</span><span class="pl-o">=</span><span class="pl-mi">2</span><span class="pl-o">*</span><span class="pl-p">(</span><span class="pl-n">n</span><span class="pl-o">-</span><span class="pl-mi">1</span><span class="pl-p">);</span>
    <span class="pl-k">else</span> <span class="pl-n">ans</span><span class="pl-p">[</span><span class="pl-n">u</span><span class="pl-p">]</span><span class="pl-o">+=</span><span class="pl-p">(</span><span class="pl-kt">long</span> <span class="pl-kt">long</span><span class="pl-p">)(</span><span class="pl-n">n</span><span class="pl-o">-</span><span class="pl-n">sum</span><span class="pl-o">-</span><span class="pl-mi">1</span><span class="pl-p">)</span><span class="pl-o">*</span><span class="pl-p">(</span><span class="pl-n">sum</span><span class="pl-o">+</span><span class="pl-mi">1</span><span class="pl-p">)</span><span class="pl-o">+</span><span class="pl-p">(</span><span class="pl-n">n</span><span class="pl-o">-</span><span class="pl-mi">1</span><span class="pl-p">);</span>
<span class="pl-p">}</span>
<span class="pl-kt">int</span> <span class="pl-nf">main</span><span class="pl-p">()</span>
<span class="pl-p">{</span>
    <span class="pl-n">n</span><span class="pl-o">=</span><span class="pl-n">read</span><span class="pl-p">(),</span><span class="pl-n">m</span><span class="pl-o">=</span><span class="pl-n">read</span><span class="pl-p">();</span>
    <span class="pl-k">for</span><span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">i</span><span class="pl-o">=</span><span class="pl-mi">1</span><span class="pl-p">;</span><span class="pl-n">i</span><span class="pl-o">&lt;=</span><span class="pl-n">m</span><span class="pl-p">;</span><span class="pl-n">i</span><span class="pl-o">++</span><span class="pl-p">)</span>
    <span class="pl-p">{</span>
        <span class="pl-kt">int</span> <span class="pl-n">x</span><span class="pl-p">,</span><span class="pl-n">y</span><span class="pl-p">;</span>
        <span class="pl-n">x</span><span class="pl-o">=</span><span class="pl-n">read</span><span class="pl-p">(),</span><span class="pl-n">y</span><span class="pl-o">=</span><span class="pl-n">read</span><span class="pl-p">();</span>
        <span class="pl-n">add</span><span class="pl-p">(</span><span class="pl-n">x</span><span class="pl-p">,</span><span class="pl-n">y</span><span class="pl-p">),</span><span class="pl-n">add</span><span class="pl-p">(</span><span class="pl-n">y</span><span class="pl-p">,</span><span class="pl-n">x</span><span class="pl-p">);</span>
    <span class="pl-p">}</span>
    <span class="pl-n">tarjan</span><span class="pl-p">(</span><span class="pl-mi">1</span><span class="pl-p">);</span>
    <span class="pl-k">for</span><span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">i</span><span class="pl-o">=</span><span class="pl-mi">1</span><span class="pl-p">;</span><span class="pl-n">i</span><span class="pl-o">&lt;=</span><span class="pl-n">n</span><span class="pl-p">;</span><span class="pl-n">i</span><span class="pl-o">++</span><span class="pl-p">)</span> <span class="pl-n">printf</span><span class="pl-p">(</span><span class="pl-s">&quot;%lld</span><span class="pl-se">\n</span><span class="pl-s">&quot;</span><span class="pl-p">,</span><span class="pl-n">ans</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">]);</span>
    <span class="pl-k">return</span> <span class="pl-mi">0</span><span class="pl-p">;</span>
<span class="pl-p">}</span>
</cpde></pre></div>